While most of the tasks undertaken by the interns were undemanding, a fact that led to the flood of applicants for the positions each year, there was one _______ duty: cleaning out the garbage bins in the laboratory.A. unambiguousB. facileC. arduousD. onerousE. tenebrousF. lucid

Re: While most of the tasks undertaken by the interns were [#permalink]
13 Sep 2017, 17:39

Expert's post

Explanation

The trigger while indicates that most of the tasks, which are described as undemanding, differ from the one described in the blank; hence, you need a word like demanding. Both arduous and onerous can mean demanding, so choices (C) and (D) give you appropriate, equivalent sentences. Choices (A) and (F) give you synonymous meanings, but nothing in the sentence supports the description of the tasks as clear.

Hence options C and D are correct!_________________

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